22 results about "Slip frequency" patented technology

The invention discloses an AC excitation system self-starting control method and system, and the method comprises the steps: obtaining a rotor current rotation frequency and an actual rotor rotation frequency, and generating a slip frequency; the slip frequency is compared with a preset dynamic threshold value, and the rotating speed given value is dynamically adjusted; inquiring a preset multi-stage sectional type current control curve according to the actual rotor rotation frequency, and outputting a d-axis current given value; pI adjustment is carried out based on the slip frequency to generate a q-axis current given value, and corresponding preset current threshold limit is applied according to the frequency band where the actual rotor rotation frequency is located; performing independent parameter configuration on the magnetic flux current control loop and the torque current control loop by adopting a non-coupling parameter setting algorithm; and in the unit starting process, under the condition that the stable starting constraint condition is met, an optimal starting parameter combination is generated. According to the invention, by dynamically adjusting the rotating speed given value and controlling the current in a segmented manner, the stable self-starting of the alternating current excitation system is realized, and the reliability and efficiency of the starting process are improved.

The invention discloses an induction motor control method and system and a medium. The control method comprises the following steps: acquiring a d-axis current # imgabs0 #, a q-axis current # imgabs1 #, a q-axis voltage # imgabs2 #, a d-axis voltage # imgabs3 # and a slope given frequency # imgabs4 # of a stator side of an induction motor at the current moment in real time; and the observer estimates the synchronous frequency # imgabs10 #, the rotor rotating speed # imgabs11 #, the slip frequency # imgabs12 #, the rotor magnetic field angle # imgabs13 # and the rotor flux linkage vector # imgabs14 # of the induction motor in real time according to the d-axis current # imgabs5 #, the q-axis current # imgabs6 #, the q-axis voltage # imgabs7 #, the d-axis voltage # imgabs8 # and the slope given frequency # imgabs9 # at the current moment. Whether the slope given frequency # imgabs15 # is smaller than a set threshold value # imgabs16 # or not is judged, and switching between the first control stage and the second control stage is conducted according to the judgment result. Current and rotating speed double-closed-loop control is adopted in the first control stage, speed fluctuation of the first control stage can be effectively restrained, on-load output current is reduced, current impact at the switching moment of the first control stage and the second control stage is reduced, and the switching stability between the first control stage and the second control stage is improved.

The invention relates to the technical field of data processing, and discloses an efficient thruster power management optimization method and system. The method comprises the following steps: pre-judging load sudden change through magnetic coupling slip frequency feature extraction and shunting power in advance, establishing an energy transfer channel through a multi-thruster power state matrix to realize power mutual feedback between thrusters, inversely calculating a bearing friction coefficient through a power balance method, and calculating compensation power by adopting a nonlinear mapping self-learning algorithm. And superposing the pre-distributed power, the transfer power and the compensation power to generate an output instruction, thereby realizing power predictive distribution, energy cyclic utilization and self-adaptive optimization management. According to the invention, predictive distribution of the power of the underwater propeller, two-way cyclic utilization of energy and multi-working-condition adaptive optimization management are realized.

The invention discloses a railway vehicle sanding rack test device and test method, and belongs to the technical field of railway vehicle sanding tests. The test device comprises a rack for bearing a gear box, a steel frame arranged at the top end of the gear box, wheels hoisted at the two ends of the steel frame, and a sand box arranged at the end part of the steel frame, the interior of the gearbox is connected with wheels through a transmission device. The rotary input motor is arranged at one end of the gearbox and drives the gearbox to drive the steel frame to rotate; the slip frequency input motor is arranged at the other end of the gear box and drives the wheels to rotate through a transmission device, so that slip frequency between wheel rails is generated; wherein the top end of the rack is horizontally and fixedly connected with an annular track which is in contact with a wheel and corresponds to the lower part of the wheel, so that the sand box sprays sand to the annular track in front of the running wheel, and a sanding tackifying test of a railway vehicle under the condition that oil and water pollutants exist between wheel rails is simulated; the device can simulate the actual working state of sanding and tackifying between wheel rails of a real vehicle, and has the beneficial effect of real and reliable test result.

To identify the stick-slip frequency.SOLUTION: A data acquisition part 46 acquires vibration data 40 indicating the time variation of vibration frequency components for each vibration frequency of a specimen S detected by the accelerometer 16 based on the vibration level of the specimen S. The data acquisition part 46 also acquires acoustic data 42 indicating the time variation of acoustic frequency components for each acoustic frequency based on the sound pressure level of the sound emitted by the specimen S detected by the microphone 18. A frequency identification part 48 identifies the vibration frequency with relatively large vibration frequency components in the vibration data 40 as the stick-slip frequency. Alternatively, the frequency identification part 48 identifies the acoustic frequency with relatively large acoustic frequency components in the acoustic data 42 as the stick-slip frequency.SELECTED DRAWING: Figure 2

The application discloses a slip power control method of a linear motor, a maglev train, equipment and a medium, and relates to the technical field of linear motor control. The method comprises the following steps: controlling a first double-fed linear motor and a second double-fed linear motor to generate different primary power supply frequencies, and then obtaining different slip frequencies; under the premise of controlling the first double-fed linear motor and the second double-fed linear motor to generate a required composite driving force, respectively controlling a pair of balance forces with equal size and opposite directions to be superposed on the secondaries of the first double-fed linear motor and the second double-fed linear motor; and according to the slip frequencies, adjusting the size of the balance forces to adjust the slip power of the first double-fed linear motor and the second double-fed linear motor. The application can effectively control the slip power when the reaction force of the double-fed linear motor is insufficient.

The disclosure of this method is intended for the predictive maintenance market, presenting an innovative method for detecting faults in hydraulic couplings, crucial components in power transmission systems across various industrial sectors. Slippage in hydraulic couplings, which is a loss of efficiency in torque transmission, can indicate wear, insufficient / excessive lubricant, or other problems, resulting in unplanned downtime and maintenance costs. The method uses metrics extracted from vibration signals to identify slippage, such as SFI (Slipping Frequency Indicator) and SNR (Signal-to-Noise Ratio). The combination of these metrics and other signal processing allows for accurate and reliable slippage detection, preventing catastrophic failures in industrial systems.

The present invention discloses a method and related equipment for monitoring the wear degree of the mill liner based on the vibration spectrum, belonging to the field of mill monitoring. Based on the vibration spectrum, this method selects the characteristic spectrum related to the state of the mill liner in the vibration spectrum, that is, the steel ball slipping characteristic frequency. By comparing the steel ball slipping frequency obtained through on-site monitoring with the steel ball slipping characteristic frequency, the wear condition of the mill liner in the cylinder can be effectively determined. Using this method, there is no need to disassemble the mill, and it is not restricted by time and space, so that the wear degree of the mill liner in the cylinder can be monitored timely and accurately. At the same time, according to the wear condition of the liner, the wear condition and replacement condition of the liner can be evaluated, effectively ensuring the normal and efficient operation of the liner, reducing the operation cost of the mill, and improving the safe production operation level of the thermal power plant.

The invention relates to the technical field of in-cabinet temperature control protection, in particular to a slip frequency cabinet fan feedback protection and control loop. The central control module controls start and stop of a slip frequency cabinet cooling fan and receives a fan operation state and a fault signal; the cooling monitoring module is connected to the central control module, and a loop is disconnected as required; the auxiliary on-off module comprises double air switch groups and matched antioxidant 1NO / NC auxiliary contacts and is used for fan power supply control and state feedback. The 1NO / NC type auxiliary contact with good sealing performance and high oxidation resistance is adopted to replace an original contact, the problem of contact resistance rising caused by moisture and corrosion is remarkably solved, the feedback stability of on-off state signals of the fan is enhanced, the temperature control switch with the action temperature being 60 DEG C is introduced, fire diffusion caused by continuous operation of the fan is prevented, and the service life of the fan is prolonged. And the wiring ports and the wire numbers of the air switches F1 and F2 and the auxiliary contacts are regulated in a standardized manner, so that the maintenance path is simplified, the operation complexity of operation and maintenance is reduced, and the operation reliability and the system maintainability are improved.

The application discloses an alternating current excitation system self-starting control method and system, and the method comprises the following steps: acquiring a rotor current rotating frequency and an actual rotor rotating frequency, and generating a slip frequency; comparing the slip frequency with a preset dynamic threshold value, and dynamically adjusting a rotating speed given value; inquiring a preset multi-stage segmented current control curve according to the actual rotor rotating frequency, and outputting a d-axis current given value; generating a q-axis current given value based on PI adjustment of the slip frequency, and applying a corresponding preset current threshold value limit according to a frequency band where the actual rotor rotating frequency is located; adopting a non-coupling parameter setting algorithm to independently configure parameters of a magnetic flux current control loop and a torque current control loop; and generating an optimal starting parameter combination under the condition of meeting a stable starting constraint condition in a unit starting process. The application realizes stable self-starting of the alternating current excitation system by dynamically adjusting the rotating speed given value and segmentally controlling the current, and improves the reliability and efficiency of the starting process.

The invention discloses a power droop control system of a brushless doubly-fed motor, which relates to the technical field of motor control and is characterized in that real-time locking and high-speed detection of the rotating speed w of a motor rotor are realized by using an encoder, and a rotating speed coordinate system and a control reference are established; arranging a stator-rotor side voltage sensor, a current sensor, a slip frequency sensor and the like and a vibration accelerometer, capturing a multi-point electrical mechanical state, and comparing the state with a standard motor model to obtain state change information; the information acquisition module forms a data set, calculates and dynamically adjusts a droop coefficient and a compensation gain, so that power deviation, total harmonic distortion and voltage deviation are effectively reduced, and the system efficiency is improved; through the generated comprehensive abnormal index and evaluation, motor operation abnormity is judged, dynamic compensation for slip frequency and power factor change is triggered, gain interval setting and state change adjustment are carried out, response time is shortened, and stability of electric energy quality is maintained. The system can quickly respond to load change, and ensures the stability and reliability of the motor in a complex environment.

The invention discloses an anti-slip control method and system for hot continuous rolling production of an ultrathin aluminum plate base. The anti-slip control method comprises the following steps that S1, roller surface modification is conducted, specifically, a CrAlN / TiN gradient composite coating is prepared through a physical vapor deposition technology; s2, a lubricating medium is configured and supplied, specifically, the oil film thickness and flow of the finish rolling section are precisely controlled through an intelligent lubricating system; s3, setting a rolling process procedure: designing and executing a reduction rate gradient distribution strategy from rough rolling to finish rolling based on the characteristics of a hot continuous rolling unit; and S4, dynamic monitoring and adjustment are conducted, specifically, when it is detected that the rolling force fluctuation exceeds a preset threshold value, the reduction rate and the rolling speed of the target rack are automatically and finely adjusted through a rolling force-speed linkage control model. According to the collaborative anti-slip control method and system, the special roller surface, the stable lubrication interface, the matching reduction schedule and the dynamic response mechanism are integrated, the slip frequency is fundamentally reduced, strip surface scratches and roller aluminum sticking are reduced, and the product surface quality and the yield are improved.

The invention relates to the technical field of petroleum engineering equipment control, in particular to a fluid adding method based on coupling feedback of a rotor pump and a mass flow meter. The rotating speed of the rotor pump is adjusted based on the slip frequency, and the flow speed and additive amount of the high-viscosity fluid are adjusted; and a slip calculation model is provided. According to the method, the slip frequency model based on the in-pump leakage mechanism is introduced for the first time, the slip frequency amount which is generated by the high-viscosity fluid in the pump and changes along with time can be recognized in real time, the problem that the slip frequency is uncontrollable due to high viscosity is solved, and the flow precision is remarkably improved.

To provide a power conversion device and a motor control system capable of implementing stable speed control even if a speed response is enhanced. Therefore, there are provided a power converter 2 that converts DC power into AC power and outputs the AC power to an induction motor based on AC voltage command values vu*, vv*, and vw* in stationary coordinates, and a controller CT that calculates the voltage command values in the stationary coordinates by vector control. The controller CT adds, to a steady-state value of a slip frequency determined by a d-axis current (id), a q-axis current (iq), and a secondary time constant (T2), a transient value determined by differential calculation using the d-axis current (id) and the q-axis current (iq) to calculate a slip frequency command value ωs**.

An arrangement for determining the operational performance of a rotating electric machine connected to an operating voltage includes a sensor apparatus and a computing device. The sensor apparatus is designed to capture a stray magnetic field outside the machine and to calculate from the captured stray magnetic field a slip frequency and a synchronous frequency. An enhanced equivalent circuit diagram including predetermined, machine-specific parameters is stored on the computing device. The computing device is configured to determine, on the basis of the calculated slip frequency and synchronous frequency, a slip and then to determine the operational performance of the machine by the enhanced equivalent circuit diagram.

The invention belongs to the technical field of motor control, particularly relates to a segmented linear induction motor thrust optimization control method based on a stator reconstruction identification model, and aims to solve the problem of thrust output reduction caused by parameter change of a segmented linear motor in short-time ultrahigh-speed operation. The method comprises the following steps: defining a stator length coefficient of an uncovered area of a rotor, and carrying out weighted average on segmented stator current to generate virtual stator current; a first-order low-pass filter is adopted to observe voltage of a non-coverage section, compensation reconstruction is carried out on voltage of a power supply section in combination with a length coefficient to obtain equivalent stator voltage, the equivalent stator voltage and virtual current are input into a reference model and an adjustable model respectively, and a rotor resistance identification value is generated through flux linkage errors of the equivalent stator voltage and the virtual current via a PI controller. And calculating the change rate of the identification value relative to the initial value, and synchronously adjusting the slip frequency given value to realize motor thrust optimization. According to the invention, the problem that the thrust output is reduced due to parameter change of the segmented linear motor in short-time ultrahigh-speed operation is effectively solved.

The invention relates to the technical field of brushless doubly-fed motors, and particularly provides a slip type vector control method for double electrical ports of a brushless doubly-fed motor, and the method comprises the steps: building a mathematical model of a motor in a unified synchronous rotating coordinate system; then, rotor field orientation is carried out on the power motor and the control motor, and a slip type vector control expression containing a slip frequency, a rotor flux linkage and a stator current instruction relation is derived based on the model; processing the rotating speed deviation through a speed controller to obtain an electromagnetic torque instruction, and calculating a slip frequency instruction value by using a torque-slip associated equation in combination with a given rotor flux linkage instruction; and finally, the instruction value is substituted into an expression to generate a stator current instruction, and cooperative control of the dual ports is realized through current loop control and SVPWM (Space Vector Pulse Width Modulation). According to the invention, the slip frequency and loss during system operation are effectively reduced, the problems of overlarge current and overheat of the motor in single-port control are solved, and the reliability, control precision and efficiency of the system are improved.

The present invention discloses a power droop control system for a brushless doubly-fed motor, which relates to the technical field of motor control. An encoder is used to achieve real-time locking and high-speed detection of the motor rotor speed w, and a speed coordinate system and control reference are established. Sensors for voltage, current, slip frequency, and the like, as well as vibration accelerometers, are arranged on the stator and rotor sides to capture multi-point electrical and mechanical states, and compare them with a standard motor model to obtain state change information. An information acquisition module forms and calculates a data set, dynamically adjusts the droop coefficient and compensation gain, effectively reducing power deviation, total harmonic distortion, and voltage deviation, thereby improving system efficiency. By generating and evaluating a comprehensive abnormality index, abnormal motor operation is determined, dynamic compensation for slip frequency and power factor changes is triggered, gain spacing is set, and state change adjustments are made, thereby shortening response time and maintaining stable power quality. This system can quickly respond to load changes, ensuring the stability and reliability of the motor in complex environments.

The invention relates to the technical field of electric power systems, in particular to a monitoring method for synchronous grid-connected closing of an electric power system and a related product, and the method comprises the steps: collecting voltage waveforms of a generator side and a power grid side in real time; acquiring system delay time; predicting a future synchronization moment when the phase angle difference reaches a preset target value; calculating an optimal switching-on instruction issuing moment; acquiring an actual instruction issuing moment when a monitoring system synchronizing device issues a closing instruction; comparing the optimal switching-on instruction issuing moment with the actual instruction issuing moment, and if the time error is smaller than a set value, judging that switching-on is performed in the same period; otherwise, non-synchronous closing is determined; according to the method, a theoretical optimal switching-on instruction issuing moment is calculated based on the instantaneous phase angle difference, the slip frequency and the slip angular acceleration, and is compared with an instruction moment actually issued by a field synchronizing device, so that the performance of the existing device is quantitatively evaluated.

The utility model relates to the technical field of capacitors, in particular to a capacitor aluminum foil slip frequency winding device which comprises a double-ball-way slip frequency shaft, two symmetrical bearings are slidably connected in the fixed end of the double-ball-way slip frequency shaft, the two bearings are jointly provided with a fixed screw in a threaded mode, and the fixed screw is connected with a fixed shaft in a threaded mode. A slip shaft fixing end pressing block is fixedly mounted at the upper end of the fixing screw rod, a thread at the lower end of the fixing screw rod penetrates through the autumn-original type double-ball-way slip shaft and is rotationally connected with a slip shaft fixing end supporting seat, and a limiting block is fixedly mounted on the autumn-original type double-ball-way slip shaft; the limiting block is rotationally connected with two symmetrical air connectors. According to the constant-tension material receiving device, constant-tension material receiving of multiple rolls of materials can be achieved, the situation that the materials are loose or tight due to different tension is avoided, and the situation that due to the fact that the tension of the materials with the tension problem is too large, a belt is broken and cannot be continuously wound is reduced.

This control device for an AC excitation generator motor comprises: a phase difference calculator (202) for outputting a slide excitation phase in which an armature winding phase and a rotor phase of an AC excitation generator motor are compared; a two-phase variable frequency oscillator (209) for outputting a synchronous excitation phase as a frequency command value of the synchronous excitation frequency; output switches (201a, 201b) for selecting and outputting the slide excitation phase or the synchronous excitation phase in accordance with an excitation selection signal; a command value generator for, when the synchronous excitation phase is selected, retaining a horizontal axis current command at a horizontal axis current command value at the time of switching from the slide excitation phase to the synchronous excitation phase; and a slip frequency calculator (203) for calculating the slip frequency of the slide excitation phase, wherein a stabilization gain (212) for calculating the phase correction value by inputting the comparison result of the synchronous excitation frequency and the slip frequency is provided, and the phase correction value is biased to the synchronous excitation phase.

The invention relates to a motor belt slipping detection method and system, and relates to the technical field of motor belt abnormity detection, the method comprises the following steps: receiving a vibration frequency transmitted by a belt, the receiving equipment being an acceleration sensor; performing signal preprocessing based on the vibration frequency to obtain a processed vibration frequency; performing FFT processing based on the processing vibration frequency to obtain a frequency spectrum feature map; and when the preset slipping frequency spectrum feature exists in the frequency spectrum feature map, outputting a preset belt slipping result. The method has the advantages that through vibration spectrum analysis and transmission ratio checking, belt slipping is verified in a two-way cross mode, dependence on multiple components is reduced, the detection reliability is improved, and the system cost is reduced.